Replace Dunham Bearings and Seals

To replace the bearings:

(Do not remove collet closer from spindle)

Rear Bearing Replacement:

1. Remove the collet.
2. Remove the rear snap-ring.
3. Pull knurled knob, rear bearing and drawtube completely out of the collet closer.
4. Remove bearing retainer snap-ring.
5. Install the new bearing.
6. Reassemble, or scroll down to replace front bearing.

Front Bearing Replacement:

7. Remove the collet.
8. Remove anti-rotation bracket.
9. Remove four air hoses (push-lock fittings).
10. Remove front snap-ring.
11. Slip collet closer body off main bearing mount.
12. Remove bearing retainer snap-ring.
13. Install the new bearing.
14. Reassemble and verify concentricity.

Dunham Collet Closer Parts List
(Seals highlighted in blue)